Because both still use the same distance... from the image plane.
Chuck Norcutt
C.H.Ling wrote:
> BTW, it still does not explain why the Leica RF 35mm system has the same DOF
> as other 35mm SLR system or it is not?
>
> C.H.Ling
>
> ----- Original Message -----
> From: "C.H.Ling"
>
>> For the same magnification, a 100mm equivalent lens should gives the same
>> "working distance" as a 100mm lens in 35mm system (except for close up may
>> be), it means the distance to the subject will be the same.
>>
>> C.H.Ling
>>
>> ----- Original Message -----
>> From: "Chuck Norcutt"
>>
>>> A little bit. The DoF formula wants the distance to the subject. But
>>> subject distance is measured from the image plane. If you move that
>>> forward by a few millimeters you'll get a different DoF. :-) :-)
>>>
>>> Chuck Norcutt
>>>
>>> C.H.Ling wrote:
>>>> ----- Original Message -----
>>>> From: "Tom Fenwick"
>>>>
>>>>> 2009/6/29 C.H.Ling
>>>>>> I'd love that's true then I don't need to worry the DOF of my FZ-18's
>>>>>> 1/2.5"
>>>>>> sensor and the 500mm equivalent lens as the DOF should be the same as
>>>>>> my
>>>>>> 5D
>>>>>> II with a true 500mm lens.
>>>>>>
>>>>> I wish I could explain the whole discussion, but this bit above is
>>>>> easy -
>>>>> you've mucked things up on the FZ-18 by moving the sensor/film plane
>>>>> towards
>>>>> the lens!
>>>>>
>>>>> Tom
>>>>>
>>>> Really? The film plane to lens distance will affect the DOF? What about
>>>> the
>>>> DOF of Leica RF 35mm to OM 35mm system?
>>>>
>>>> C.H.Ling
>
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